CHICAGO (FOX 32 NEWS) - Cook County Sheriff Thomas Dart has taken steps to increase transparency of misconduct among correctional officers in Cook County Jail.

On Thursday, that transparency shifted to inmate misconduct with the release of four videos of inmates attacking correctional officers since the beginning of May, resulting in four aggravated battery charges.

“Unfortunately, some of our detainees – particularly in our maximum security divisions – consistently subject correctional staff to violent assaults, verbal threats, indecent exposure, spit and even urine and feces," Dart said in a statement. "I will continue to do whatever is necessary to protect our staff by holding these detainees accountable for the criminal acts they commit in the jail.”

Since January 2015, 163 detainees at Cook County Jail have been criminally charged with Aggravated Battery on a Peace Officer.